Redler conveyors

Speeds of 200 ft/min or more are attainable. Example 5.5 shows that the power requirement is much less than that of the Redler conveyor. 

Neutralization of the sulfonic acid and building up with sodium sulfate and tetrasodium pyrophosphate (TSPP) is accomplished in two batch reactors (5 hr cycle) operated alternately. The sodium sulfate is pumped in solution with its transfer pump from the sodium sulfate system (which can be represented by a block). The TSPP is supplied as a solid and is fed by means of a Redler conveyor which discharges into a weigh hopper running on a track above the two reactors. Each reactor is agitated with a propeller and a turbine blade in a single shaft. 

FIGURE 32.13 Osmotic dehydration with re-concentration of hypertonic solution (1) feeding conveyor (2) osmotic dehydrator (3) redler conveyor (4) heat exchanger (5) scraped surface evaporator (6) thermo-compressor (7) driven wheel flow of hypertonic solution —, vapor =>, high pressure steam -heating steam). 

Drag-type conveyors (Redler) are suited to short distances in any direction and are completely enclosed. Units range in size from 3 in. square to 19 in. square and may travel from 30 ft/min (fly ash) to 250 ft/min (grains). Power requirements are high. 

The angle of repose is a measure of the incline at which conveyors such as screws or belts can carry the material. The tangent of the angle of repose is the coefficient of sliding friction. This property is a factor in the power needed to transfer the material by pushing or dragging as in pneumatic, screw, flight, and Redler equipment. 

TABLE 5.7. Speed and Horsepower of Drag-Type Conveyors of Redler Design8... 

Soda ash of bulk density 301b/cuft is to be moved 120 ft horizontally and 30 ft vertically at the rate of 350 cuft/hr. Compare power requirements of Redler and zippered belt conveyors for this service. 

Figure 5.11. Drag-type enclosed conveyor-elevator (Redler Design) for transfer in any direction (Stephens-Adamson Mfg. Co.), (a) Head and discharge end of elevator, (b) Carrying and return runs, (c) Loading end. (d) Some shapes of flights some are made close-fitting and edged with rubber or plastics to serve as cleanouts.

Comparison of Redler and Zippered Belt Conveyors 88 Density of a Nonideal Gas from Its Equation of State 91 Unsteady Flow of an Ideal Gas through a Vessel 93 Units of the Energy Balance 94... 

One design of a drag-type of machine is the Redler shown on Figure 5.8. There are various designs for the flights as illustrated in Figure 5.8. One type of drag conveyor, the Hapman conveyor, consists of circular disks mounted on a chain inside a pipe. As the conveyor is operated, the disks entrap material from the inlet to the outlet of the conveyor. The clearance between the disk and the... 

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